Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  M101  ·  NGC 5457  ·  NGC 5473  ·  NGC 5477  ·  NGC5447  ·  NGC5449  ·  NGC5450  ·  NGC5451  ·  NGC5453  ·  NGC5455  ·  NGC5461  ·  NGC5462  ·  NGC5471  ·  NGC5473  ·  NGC5477  ·  Pinwheel galaxy
M101- Pinwheel Galaxy, 



    
        

            lefty7283
Powered byPixInsight

M101- Pinwheel Galaxy

M101- Pinwheel Galaxy, 



    
        

            lefty7283
Powered byPixInsight

M101- Pinwheel Galaxy

Technical card

Imaging telescopes or lenses: TPO 6" f/4 Newtonian

Imaging cameras: ZWO ASI1600MM-Pro

Mounts: Orion Sirius EQ-G

Guiding telescopes or lenses: Agena 50mm Deluxe Straight-Through Finder / Guide Scope with Helical Focuser

Guiding cameras: ZWO ASI 120 MC

Software: Nighttime Imaging 'N' Astronomy  ·  PixInsight 1.8 Ripley PixInsight

Filters: Astronomik B 31 mm Type IIc  ·  Astronomik G 31 mm Type IIc  ·  Astronomik R 31 mm Type IIc  ·  Astronomik L 31mm Type IIc

Accessory: ZWO EFW 8 x 1.25″/31mm  ·  Moonlite Model CR Newtonian 2" Format Focuser  ·  SkyWatcher Quattro Coma Corrector


Dates:April 16, 2019April 22, 2019May 5, 2019May 6, 2019

Frames:
Astrodon Ha 31mm 5nm: 39x300" (3h 15') (gain: 139.00) -20C
Astronomik B 31 mm Type IIc: 17x300" (1h 25') (gain: 139.00) -20C
Astronomik G 31 mm Type IIc: 17x300" (1h 25') (gain: 139.00) -20C
Astronomik L 31mm Type IIc: 88x300" (7h 20') (gain: 139.00) -20C
Astronomik R 31 mm Type IIc: 17x300" (1h 25') (gain: 139.00) -20C

Integration: 14h 50'

Darks: ~30

Flats: ~30

Avg. Moon age: 7.87 days

Avg. Moon phase: 44.97%

Bortle Dark-Sky Scale: 4.33


Astrometry.net job: 2697277

RA center: 14h 3' 12"

DEC center: +54° 20' 59"

Pixel scale: 0.650 arcsec/pixel

Orientation: 0.345 degrees

Field radius: 0.906 degrees


Resolution: 7842x6268

Locations: Deerlick Astronomy Village, Sharon, GA, United States

Data source: Backyard

Description

This marks 2 years of astrophotography for me. I've made a comparison with my attempts at M101 from previous years, more details can be found here: https://redd.it/bowqo3

**[PixInsight Processing](https://i.imgur.com/HA90SwC.png):**

* BatchPreprocessing

* SubframeSelector

* StarAlignment

* Blink

* Local Normalization



* ImageIntegration

* DrizzleIntegration (2x, VarK=1.5)

* DynamicCrop

* DynamicBackgroundExtraction 2x

* **Luminance:**

* PSFImage/ADVStarMask/RangeSelection/CloneStamp

* Deconvolution

* TVG/MMT Noise Reduction (Per [Jon Rista's Tutorial](https://jonrista.com/the-astrophotographers-guide/pixinsights/effective-noise-reduction-part-2/))

* ArcsinhStretch

* ACDNR

* **RGB:**

* LinearFit to Green

* ChannelCombination

* NBRGBCombination (to combine Ha data with RGB)

* PhotometricColorCalibration

* SCNR

* HSV Repair

* ArcsinhStretch

* HistogramTransformation

* LRGBCombination with Luminance

* HistogramTransformation

* [Curve](https://i.imgur.com/UFe3v5o.jpg)Transformations

* LocalHistogramEqualization

* SCNR

* More Curves and LHE Adjustments

* MorphologicalTransformation to reduce star sizes

* Even *more* Curves and LHE

* ColorSaturation

* Annotation

Comments

Sky plot

Sky plot

Histogram

M101- Pinwheel Galaxy, 



    
        

            lefty7283

In these public groups

ZWO ASI1600MM/QHY163M